"No Answer" Error

This error is not due to busy lines (in addition, you'd also hear the busy signal through your modem). Whenever you call in and hear the modems make the loud screeching noises, that means that there is definitely an answer. If it then comes up with the "No Answer" message, then your modem simply cannot negotiate with our modem. It could also be trying to negotiate at speeds higher than your phone lines/modem driver will allow.